diesel-guard: Add configuration file

Migrations prior to `2025-09-04` unfortunately result in SQL parser issues due to unsupported constructs.

Author: Turbo87

diesel-guard.toml

@@ -0,0 +1,32 @@
+# diesel-guard configuration file
+
+# Skip checking migrations created before this timestamp
+# Useful for retrofitting diesel-guard into existing projects
+# Accepted formats: YYYYMMDDHHMMSS, YYYY_MM_DD_HHMMSS, or YYYY-MM-DD-HHMMSS
+# Works with any migration directory format regardless of separator style
+#
+# Examples: Skip all migrations before January 1, 2024
+# start_after = "2024_01_01_000000"  # underscores
+# start_after = "2024-01-01-000000"  # dashes
+# start_after = "20240101000000"     # no separators
+start_after = "2025-09-04-000000"
+
+# Whether to check down.sql files in addition to up.sql
+# Default: false
+#
+# Set to true if you want to ensure rollback migrations are also safe
+# check_down = false
+
+# Disable specific safety checks
+# Valid check names:
+#   - AddColumnCheck          (ADD COLUMN with DEFAULT)
+#   - AddIndexCheck           (CREATE INDEX without CONCURRENTLY)
+#   - AddNotNullCheck         (ALTER COLUMN SET NOT NULL)
+#   - AlterColumnTypeCheck    (ALTER COLUMN TYPE)
+#   - DropColumnCheck         (DROP COLUMN)
+#
+# Example: Disable checking for ADD COLUMN and DROP COLUMN operations
+# disable_checks = ["AddColumnCheck", "DropColumnCheck"]
+#
+# Default: [] (all checks enabled)
+disable_checks = ["AddColumnCheck"]